MAINTAINERS: add "DEVICE I/O & IRQ [RUST]" entry

MAINTAINERS: add "DEVICE I/O & IRQ [RUST]" entry

This entry will handle device I/O patches and abstractions (such as
memory-mapped IO and system resources series [1]), as well as IRQ ones
(such as the `request_irq` series [2]).

Patches will flow through driver-core, at least for the time being.

Danilo, Alice and Daniel will maintain it.

Cc: Danilo Krummrich <dakr@kernel.org>
Cc: Alice Ryhl <aliceryhl@google.com>
Cc: Daniel Almeida <daniel.almeida@collabora.com>
Link: https://lore.kernel.org/rust-for-linux/20250717-topics-tyr-platform_iomem-v15-0-beca780b77e3@collabora.com/
Link: https://lore.kernel.org/rust-for-linux/20250715-topics-tyr-request_irq2-v7-0-d469c0f37c07@collabora.com/
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Acked-by: Daniel Almeida <daniel.almeida@collabora.com>
Acked-by: Alice Ryhl <aliceryhl@google.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/20250725202840.2251768-1-ojeda@kernel.org
Signed-off-by: Danilo Krummrich <dakr@kernel.org>